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{ IScheduler } from '../Scheduler';\nimport { Action } from '../scheduler/Action';\nimport { Observable } from '../Observable' ;\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { isScheduler } from '../util/isScheduler';\n\nconst selfSelector = <T>(value: T) => value;\n\nexport type ConditionFunc<S> = (state: S) => boolean;\nexport type IterateFunc<S> = (state: S) => S;\nexport type ResultFunc<S, T> = (state: S) => T;\n\ninterface SchedulerState<T, S> {\n needIterate?: boolean;\n state: S;\n subscriber: Subscriber<T>;\n condition?: ConditionFunc<S>;\n iterate: IterateFunc<S>;\n resultSelector: ResultFunc<S, T>;\n}\n\nexport interface GenerateBaseOptions<S> {\n /**\n * Initial state.\n */\n initialState: S;\n /**\n * Condition function that accepts state and returns boolean.\n * When it returns false, the generator stops.\n * If not specified, a generator never stops.\n */\n condition?: ConditionFunc<S>;\n /**\n * Iterate function that accepts state and returns new state.\n */\n iterate: IterateFunc<S>;\n /**\n * IScheduler to use for generation process.\n * By default, a generator starts immediately.\n */\n scheduler?: IScheduler;\n}\n\nexport interface GenerateOptions<T, S> extends GenerateBaseOptions<S> {\n /**\n * Result selection function that accepts state and returns a value to emit.\n */\n resultSelector: ResultFunc<S, T>;\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @extends {Ignored}\n * @hide true\n */\nexport class GenerateObservable<T, S> extends Observable<T> {\n constructor(private initialState: S,\n private condition: ConditionFunc<S>,\n private iterate: IterateFunc<S>,\n private resultSelector: ResultFunc<S, T>,\n private scheduler?: IScheduler) {\n super();\n }\n\n /**\n * Generates an observable sequence by running a state-driven loop\n * producing the sequence's elements, using the specified scheduler\n * to send out observer messages.\n *\n * <img src=\"./img/generate.png\" width=\"100%\">\n *\n * @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>\n * var res = Rx.Observable.generate(0, x => x < 10, x => x + 1, x => x);\n *\n * @example <caption>Using asap scheduler, produces sequence of 2, 3, 5, then completes.</caption>\n * var res = Rx.Observable.generate(1, x => x < 5, x => x * 2, x => x + 1, Rx.Scheduler.asap);\n *\n * @see {@link from}\n * @see {@link create}\n *\n * @param {S} initialState Initial state.\n * @param {function (state: S): boolean} condition Condition to terminate generation (upon returning false).\n * @param {function (state: S): S} iterate Iteration step function.\n * @param {function (state: S): T} resultSelector Selector function for results produced in the sequence.\n * @param {Scheduler} [scheduler] A {@link IScheduler} on which to run the generator loop. If not provided, defaults to emit immediately.\n * @returns {Observable<T>} The generated sequence.\n */\n static create<T, S>(initialState: S,\n condition: ConditionFunc<S>,\n iterate: IterateFunc<S>,\n resultSelector: ResultFunc<S, T>,\n scheduler?: IScheduler): Observable<T>\n\n /**\n * Generates an observable sequence by running a state-driven loop\n * producing the sequence's elements, using the specified scheduler\n * to send out observer messages.\n * The overload uses state as an emitted value.\n *\n * <img src=\"./img/generate.png\" width=\"100%\">\n *\n * @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>\n * var res = Rx.Observable.generate(0, x => x < 10, x => x + 1);\n *\n * @example <caption>Using asap scheduler, produces sequence of 1, 2, 4, then completes.</caption>\n * var res = Rx.Observable.generate(1, x => x < 5, x => x * 2, Rx.Scheduler.asap);\n *\n * @see {@link from}\n * @see {@link create}\n *\n * @param {S} initialState Initial state.\n * @param {function (state: S): boolean} condition Condition to terminate generation (upon returning false).\n * @param {function (state: S): S} iterate Iteration step function.\n * @param {Scheduler} [scheduler] A {@link IScheduler} on which to run the generator loop. If not provided, defaults to emit immediately.\n * @returns {Observable<S>} The generated sequence.\n */\n static create<S>(initialState: S,\n condition: ConditionFunc<S>,\n iterate: IterateFunc<S>,\n scheduler?: IScheduler): Observable<S>\n\n /**\n * Generates an observable sequence by running a state-driven loop\n * producing the sequence's elements, using the specified scheduler\n * to send out observer messages.\n * The overload accepts options object that might contain initial state, iterate,\n * condition and scheduler.\n *\n * <img src=\"./img/generate.png\" width=\"100%\">\n *\n * @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>\n * var res = Rx.Observable.generate({\n * initialState: 0,\n * condition: x => x < 10,\n * iterate: x => x + 1\n * });\n *\n * @see {@link from}\n * @see {@link create}\n *\n * @param {GenerateBaseOptions<S>} options Object that must contain initialState, iterate and might contain condition and scheduler.\n * @returns {Observable<S>} The generated sequence.\n */\n static create<S>(options: GenerateBaseOptions<S>): Observable<S>\n\n /**\n * Generates an observable sequence by running a state-driven loop\n * producing the sequence's elements, using the specified scheduler\n * to send out observer messages.\n * The overload accepts options object that might contain initial state, iterate,\n * condition, result selector and scheduler.\n *\n * <img src=\"./img/generate.png\" width=\"100%\">\n *\n * @example <caption>Produces sequence of 0, 1, 2, ... 9, then completes.</caption>\n * var res = Rx.Observable.generate({\n * initialState: 0,\n * condition: x => x < 10,\n * iterate: x => x + 1,\n * resultSelector: x => x\n * });\n *\n * @see {@link from}\n * @see {@link create}\n *\n * @param {GenerateOptions<T, S>} options Object that must contain initialState, iterate, resultSelector and might contain condition and scheduler.\n * @returns {Observable<T>} The generated sequence.\n */\n static create<T, S>(options: GenerateOptions<T, S>): Observable<T>\n\n static create<T, S>(initialStateOrOptions: S | GenerateOptions<T, S>,\n condition?: ConditionFunc<S>,\n iterate?: IterateFunc<S>,\n resultSelectorOrObservable?: (ResultFunc<S, T>) | IScheduler,\n scheduler?: IScheduler): Observable<T> {\n if (arguments.length == 1) {\n return new GenerateObservable<T, S>(\n (<GenerateOptions<T, S>>initialStateOrOptions).initialState,\n (<GenerateOptions<T, S>>initialStateOrOptions).condition,\n (<GenerateOptions<T, S>>initialStateOrOptions).iterate,\n (<GenerateOptions<T, S>>initialStateOrOptions).resultSelector || selfSelector as ResultFunc<S, T>,\n (<GenerateOptions<T, S>>initialStateOrOptions).scheduler);\n }\n\n if (resultSelectorOrObservable === undefined || isScheduler(resultSelectorOrObservable)) {\n return new GenerateObservable<T, S>(\n <S>initialStateOrOptions,\n condition,\n iterate,\n selfSelector as ResultFunc<S, T>,\n <IScheduler>resultSelectorOrObservable);\n }\n\n return new GenerateObservable<T, S>(\n <S>initialStateOrOptions,\n condition,\n iterate,\n <ResultFunc<S, T>>resultSelectorOrObservable,\n <IScheduler>scheduler);\n }\n\n /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<any>): Subscription | Function | void {\n let state = this.initialState;\n if (this.scheduler) {\n return this.scheduler.schedule<SchedulerState<T, S>>(GenerateObservable.dispatch, 0, {\n subscriber,\n iterate: this.iterate,\n condition: this.condition,\n resultSelector: this.resultSelector,\n state });\n }\n const { condition, resultSelector, iterate } = this;\n do {\n if (condition) {\n let conditionResult: boolean;\n try {\n conditionResult = condition(state);\n } catch (err) {\n subscriber.error(err);\n return;\n }\n if (!conditionResult) {\n subscriber.complete();\n break;\n }\n }\n let value: T;\n try {\n value = resultSelector(state);\n } catch (err) {\n subscriber.error(err);\n return;\n }\n subscriber.next(value);\n if (subscriber.closed) {\n break;\n }\n try {\n state = iterate(state);\n } catch (err) {\n subscriber.error(err);\n return;\n }\n } while (true);\n }\n\n private static dispatch<T, S>(state: SchedulerState<T, S>): Subscription | void {\n const { subscriber, condition } = state;\n if (subscriber.closed) {\n return;\n }\n if (state.needIterate) {\n try {\n state.state = state.iterate(state.state);\n } catch (err) {\n subscriber.error(err);\n return;\n }\n } else {\n state.needIterate = true;\n }\n if (condition) {\n let conditionResult: boolean;\n try {\n conditionResult = condition(state.state);\n } catch (err) {\n subscriber.error(err);\n return;\n }\n if (!conditionResult) {\n subscriber.complete();\n return;\n }\n if (subscriber.closed) {\n return;\n }\n }\n let value: T;\n try {\n value = state.resultSelector(state.state);\n } catch (err) {\n subscriber.error(err);\n return;\n }\n if (subscriber.closed) {\n return;\n }\n subscriber.next(value);\n if (subscriber.closed) {\n return;\n }\n return (<Action<SchedulerState<T, S>>><any>this).schedule(state);\n }\n}\n"]} |